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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Civic Insight weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
San Sebastian’s weather today, as the live forecast above shows, is typical of the Basque coast – mild with variable cloud and a chance of showers. The city enjoys a temperate oceanic climate, meaning cool summers, mild winters and rain spread throughout the year.
What is the climate of San Sebastian?
San Sebastian sits on the Bay of Biscay, which moderates temperatures and brings frequent rainfall. Summer highs hover around 25°C, while winter lows rarely drop below 8°C. The wettest months are November and December, but showers are common all year. For a detailed breakdown, check san sebastian weather by month averages. If you’re planning a trip, san sebastian weather 14 days forecasts give a useful short-term view.
When is the best time to visit?
Late spring (May–June) and early autumn (September–October) offer the best balance of warmth and sunshine. April brings mild conditions and fewer crowds – san sebastian weather april averages show temperatures around 15–19°C. December is cooler and wetter; san sebastian weather december often sees highs near 13°C. Longer-range outlooks like san sebastian weather 30 days can indicate broader trends, while san sebastian weather 21 days gives a mid-range guide.
Does it rain a lot in San Sebastian?
Yes, the city receives around 1,500mm of rain annually, with autumn and winter being wettest. However, showers often pass quickly, and you can still enjoy outdoor activities between rain. Light layers are recommended.
What is the sea temperature like?
Sea temperatures range from 12°C in winter to 22°C in summer. Swimming is most comfortable from July to September. For a winter visit, san sebastian weather december will show cooler sea conditions.
How far ahead can I trust a forecast?
Short-term forecasts up to 7 days are reliable. For longer-term planning, san sebastian weather 21 days or san sebastian weather 30 days provide general trends but with lower accuracy. The live forecast above is best for today’s conditions.
Sources
For comparisons with UK coastal cities, see our UK weather hub. If you’re checking san sebastian weather 14 days ahead, our 10 Day Weather Forecast UK page may offer helpful context.